Here's a good stat for you according to one of today's papers. 
Released after a trial at Middlesbrough last year. 
Draw your own conclusions, I know what mine are. 
And a certain Mr. Cantona was "released" after a trial at Sheffield Wednesday. He signed for Leeds a few days later. 
Draw your own conclusions. 
(No, I'm not saying MGP is the new Cantona. I'm just saying that there may be many reasons why someone doesn't get signed by a club)